UNIT FOUR: Transportation and Defense 20. Blood 21. Anatomy of the Cardiovascular System 22. Physiology of the Cardiovascular System 23. Lymphatic System 24. Immune System 25. Stress

UNIT FIVE: Respiration, Nutrition, and Excretion 26. Anatomy of the Respiratory System 27. Physiology of the Respiratory System 28. Anatomy of the Digestive System 29. Physiology of the Respiratory System 30. Nutrition and Metabolism 31. The Urinary System 32. Fluid and Electrolyte Balance 33. Acid-Base Balance

UNIT SIX: Reproduction and Development 34. Male Reproductive System 35. Female Reproductive System 36. Growth and Development 37. Genetics and Heredity